Journal of building engineering最新文献_第4页

Assessing indoor environmental quality of naturally ventilated classrooms in tropical climates 热带气候条件下自然通风教室室内环境质量评价

IF 6.7 2区工程技术

Journal of building engineering Pub Date : 2025-06-14 DOI: 10.1016/j.jobe.2025.113048

Vijesh Kumar Valiyappurakkal, Shivani Dolas, Aumgana Suresh, Vijayalaxmi J.

{"title":"Assessing indoor environmental quality of naturally ventilated classrooms in tropical climates","authors":"Vijesh Kumar Valiyappurakkal, Shivani Dolas, Aumgana Suresh, Vijayalaxmi J.","doi":"10.1016/j.jobe.2025.113048","DOIUrl":"10.1016/j.jobe.2025.113048","url":null,"abstract":"<div><div>Student performance is strongly influenced by indoor environmental quality, a relationship widely studied globally but less explored in tropical regions and India. This study develops an IEQ index for the tropical climates by evaluating five naturally ventilated Indian classrooms, integrating thermal comfort, indoor air quality, acoustic comfort, and visual comfort with unequal weightings. Using linear regression based on users’ subjective perceptions, the study results in weightings of 29.5% to thermal comfort, 7.8% to indoor air quality, 25.2% to acoustic comfort, and 34.3% to visual comfort. The resulting IEQ index provides a benchmark for the holistic assessment and improvement of naturally ventilated classroom environments in India’s warm and humid climate. Additionally, by prioritizing passive strategies for ventilation, lighting, and noise control, this framework can support the design of energy-efficient educational buildings, contributing to broader goals of sustainability and reduced operational energy use through enhanced indoor environmental quality.</div></div>","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"111 ","pages":"Article 113048"},"PeriodicalIF":6.7,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

State-of-the-art on liquid desiccant dehumidification systems: Components, performance, challenges and integration with evaporative cooling systems 液体干燥剂除湿系统的最新技术：组件、性能、挑战和与蒸发冷却系统的集成

IF 6.7 2区工程技术

Journal of building engineering Pub Date : 2025-06-14 DOI: 10.1016/j.jobe.2025.113175

Renuka Rekhade , Soumili Bose , Santanu Prasad Datta , Mikołaj Matuszczak , Demis Pandelidis , Mrinal Jagirdar

{"title":"State-of-the-art on liquid desiccant dehumidification systems: Components, performance, challenges and integration with evaporative cooling systems","authors":"Renuka Rekhade , Soumili Bose , Santanu Prasad Datta , Mikołaj Matuszczak , Demis Pandelidis , Mrinal Jagirdar","doi":"10.1016/j.jobe.2025.113175","DOIUrl":"10.1016/j.jobe.2025.113175","url":null,"abstract":"<div><div>Air-conditioners manage both the sensible as well as the latent heat loads for human thermal-comfort. However, they consume 37 % of the overall energy usage in buildings throughout the world. It is therefore imperative to seek alternative, more energy-efficient technologies, one of them being the Liquid Desiccant Dehumidification System, which can operate the latent heat load. This technology largely operates using low-grade waste/solar heat and requires significantly less electrical energy. The present review paper discusses the working of two major types of such open-cycle dehumidifiers, namely the adiabatic and the internally-cooled/heated as well as their variants and flow-configurations. Various desiccants and their desirable properties are also discussed along with their impact on indoor air quality. An exhaustive list of performance parameters and their definitions are provided for both types of dehumidifiers. Furthermore, experimental studies are reviewed involving several desiccants and novel systems. A back-calculation procedure is presented to calculate the idealized regeneration temperature of the liquid desiccant. Next, to realize a complete air-conditioning system, sensible heat must be handled as well. Therefore, due importance is also given to studies that integrate liquid desiccant dehumidifiers with evaporative cooling technologies, both direct and indirect. Challenges due to corrosion and strategies to mitigate it are discussed as well. Lastly, the conclusions and future work suggested may help researchers identify research gaps, the work towards which would hopefully result in LD-DS's widespread commercial adoption.</div></div>","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"111 ","pages":"Article 113175"},"PeriodicalIF":6.7,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of Steel Plate Concrete (SC) Walls with Cross-ties Under Out-of-plane Forces 面外力作用下交叉连接钢板混凝土（SC）墙体设计

IF 6.4 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113148

Jamshaid Sawab, Avinash Gautam, Peng Liang, Jiaji Wang, Y.L. Mo

{"title":"Design of Steel Plate Concrete (SC) Walls with Cross-ties Under Out-of-plane Forces","authors":"Jamshaid Sawab, Avinash Gautam, Peng Liang, Jiaji Wang, Y.L. Mo","doi":"10.1016/j.jobe.2025.113148","DOIUrl":"https://doi.org/10.1016/j.jobe.2025.113148","url":null,"abstract":"guidelines for predicting the capacity of Steel Plate – Concrete (SC) walls under out-of-plane forces are explained and proposed. A detailed explanation of the behavior of SC walls and their modes of failure is also included. An SC wall under out-of-plane forces could reach a desired failure mechanism such as flexure or shear only if the composite action between the steel plate and concrete is sufficient. Otherwise, debonding, the failure mechanism associated with composite action, could govern. A design equation is derived to predict the composite action capacity accurately. The design guidelines and the proposed equation is validated using an experimental database of eight SC beams under varying <ce:math altimg=\"si1.svg\"></ce:math> ratios, longitudinal reinforcement ratio, transverse reinforcement ratio, and concrete strength. Systematic comparison between test results and proposed design guidelines are conducted and showed the proposed method has high accuracy and safety compared to existing method. The research outcome clarifies the interaction between flexural capacity, shear capacity and provide efficient methods for practical designers for conventional SC composite walls and also steel-Ultra high performance concrete composite walls.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"27 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Factors influencing the mechanical strength of geopolymer-based ultra-high-performance concrete (G-UHPC): A systematic review from materials to processes 影响地聚合物基高性能混凝土（G-UHPC）机械强度的因素：从材料到工艺的系统综述

IF 6.7 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113095

Zhenzhen Liu , Bing Chen , Xiangrui Meng

{"title":"Factors influencing the mechanical strength of geopolymer-based ultra-high-performance concrete (G-UHPC): A systematic review from materials to processes","authors":"Zhenzhen Liu , Bing Chen , Xiangrui Meng","doi":"10.1016/j.jobe.2025.113095","DOIUrl":"10.1016/j.jobe.2025.113095","url":null,"abstract":"<div><div>Traditional ultra-high-performance concrete (UHPC) has a significant environmental impact due to its high cement content, leading to increased interest in sustainable alternatives. Geopolymer-based ultra-high-performance concrete (G-UHPC) has recently attracted attention because of its lower carbon footprint and environmental advantages. Although research on G-UHPC is still in its early phases, its mechanical strength has emerged as a critical performance indicator. Based on existing literature, this paper provides a comprehensive review of the key factors influencing G-UHPC's mechanical strength. The review examines the effects of chemical components, such as binders, activators, aggregates, and fibers, on mechanical strength and their synergistic interactions. Additionally, it analyzes how mixing ratios and curing conditions, as crucial process parameters, affect the mechanical properties of G-UHPC. Furthermore, the paper summarizes commonly used optimal designs and curing techniques. Finally, it outlines potential future research directions for G-UHPC. This review offers valuable insights for scholars and engineers seeking to enhance their understanding of the strength development mechanisms in G-UHPC and promotes the advancement of this emerging material.</div></div>","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"111 ","pages":"Article 113095"},"PeriodicalIF":6.7,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application-oriented multi-level framework for dimensional quality inspection of prefabricated laminated slabs 面向应用的预制叠合板尺寸质量检测多级框架

IF 6.7 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113179

Qingze Li , Yang Yang , Gang Yao , Gang Liao

{"title":"Application-oriented multi-level framework for dimensional quality inspection of prefabricated laminated slabs","authors":"Qingze Li , Yang Yang , Gang Yao , Gang Liao","doi":"10.1016/j.jobe.2025.113179","DOIUrl":"10.1016/j.jobe.2025.113179","url":null,"abstract":"<div><div>Dimensional quality inspection (DQI) of prefabricated laminated slabs (PLS) is critical for on-site construction efficiency, yet existing techniques suffer from delayed inspection timelines and limited inspection scopes. To address these issues, an application-oriented multi-level DQI framework for PLS is proposed in this paper, namely, Identification-Segmentation-Measurement based on YOLOv8 and the Segment Anything Model (YS-ISM). YS-ISM enables the online DQI of PLS in production. YS-ISM consists of four steps: (1) pre-training of the benchmark identification model, (2) targeted improvement of the benchmark identification model, (3) pixel-level target segmentation, and (4) multi-target dimensional measurement. Numerical experiments demonstrate that the improved model, featuring the proposed Context-Enhanced Feature Fusion Pyramid Network (CEFFPN), enables more effective feature aggregation and contextual information propagation. By leveraging the channel partition selection mechanism of Dimension-Aware Selective Integration (DASI) and Shape-IoU, which balances focus on bounding box shape and scale, it overcomes inaccurate small-target localization caused by nesting and occlusion in PLS. The improved model achieves 82.4 % and 70.2 % mAP0.5_0.95 for holes and PVC boxes, representing 15.5 % and 10.9 % improvements over the benchmark model. The effectiveness of YS - ISM has been verified in practical applications. For the contour dimensions of the laminated panel and the coordinates of the PVC box, the maximum recognition errors are 1.4 % and 34.3 mm, respectively. For the hole, the maximum diameter error is 10.6 mm and the maximum coordinate error is 25.4 mm. which has a positive impact on prefabricated concrete components quality control. The outcomes of the application demonstrate the considerable potential of YS-ISM in the DQI of PLS, which has a positive impact on the development of prefabricated buildings.</div></div>","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"111 ","pages":"Article 113179"},"PeriodicalIF":6.7,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Elucidating the rate-dependent shear failure mechanism in cement fractures based on multi-parameter acoustic emission analysis 基于多参数声发射分析的水泥裂缝速率相关剪切破坏机制研究

IF 6.7 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113161

Dongqi Shang , Sunhao Zhang , Yujing Jiang , Xiaoshan Wang , Jinge Zhang , Jie Liu , Yan Wang

{"title":"Elucidating the rate-dependent shear failure mechanism in cement fractures based on multi-parameter acoustic emission analysis","authors":"Dongqi Shang , Sunhao Zhang , Yujing Jiang , Xiaoshan Wang , Jinge Zhang , Jie Liu , Yan Wang","doi":"10.1016/j.jobe.2025.113161","DOIUrl":"10.1016/j.jobe.2025.113161","url":null,"abstract":"<div><div>Gaining insight into the rate-dependent shear failure behavior of cement fractures is crucial for the design and safety evaluation of cement-based structures. Direct shear tests were conducted under constant normal load (CNL) conditions with multi-parameter acoustic emission (AE) monitoring. As the shear rate increased from 2.5 mm/min to 20 mm/min, the peak shear stresses for groups SA, SB, and SC decreased from 2.95 MPa, 2.61 MPa, and 2.21 MPa–2.23 MPa, 1.87 MPa, and 1.69 MPa, corresponding to reduction rates of 24.4 %, 28.4 %, and 23.5 %, respectively. Similarly, the residual shear stresses declined from 2.86 MPa, 2.21 MPa, and 1.67 MPa–2.02 MPa, 1.81 MPa, and 1.57 MPa, with reduction rates of 29.4 %, 18.1 %, and 5.9 %, respectively. The results demonstrated a negative correlation between shear stress and shear rate, attributed to a transition from gnawing failure (GF) to sliding failure (SF). AE signals showed distinct activity near peak shear stress, emphasizing their effectiveness in capturing failure evolution. Crack classification using the RA–AF method combined with a Gaussian Mixture Model (GMM) verified the GF-to-SF transition and the corresponding proportions of crack types, consistent with multifractal analysis. Dominant tensile cracks were associated with the degradation of second-order asperities. Additionally, a higher post-peak stress drop rate (PPSDR) at low shear rates indicates a transition in frictional behavior, whereas a lower PPSDR at higher rates reflects the persistence of stable sliding friction. This study contributes significantly to a better understanding of the rate-dependent shear failure mechanism in cement fractures.</div></div>","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"111 ","pages":"Article 113161"},"PeriodicalIF":6.7,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interior panel selection for light-timber structure buildings under intermittent energy use: Balancing mould risk and energy efficiency 间歇性能源使用下的轻木结构建筑内饰板选择：平衡霉菌风险和能源效率

IF 6.7 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113182

Jiang Lu , Yucong Xue , Wanqing Xu , Jian Ge

{"title":"Interior panel selection for light-timber structure buildings under intermittent energy use: Balancing mould risk and energy efficiency","authors":"Jiang Lu , Yucong Xue , Wanqing Xu , Jian Ge","doi":"10.1016/j.jobe.2025.113182","DOIUrl":"10.1016/j.jobe.2025.113182","url":null,"abstract":"<div><div>Light-framed timber structure (LTS) buildings are increasingly utilized in the hot summer and cold winter climate zone due to their renewability, energy efficiency, and low carbon footprint. However, heat and moisture transfer (HAMT) within the building envelope becomes highly complex under the intermittent energy consumption mode commonly adopted in this region, impacting energy performance, indoor environmental creation, and moisture risk prevention. In these processes, interior panels, serving as the primary pathway for HAMT between indoor environment and building envelopes, play a critical but often overlooked role in mould prevention and moisture regulation. To assess the comprehensive impacts of energy consumption mode and identify the optimal strategy for interior panels, this study employed numerical simulations conducted using WUFI-Plus, validated through in-situ experimental data. Results showed that, although intermittent modes met indoor hygrothermal requirements only about 25 % of the time and were less effective in controlling temperature and relative humidity compared to continuous modes, they significantly reduced mould growth risks by leveraging daytime ventilation while achieving a 72.0 % reduction in annual energy consumption. Interior panels with high water vapour permeability helped lower envelope moisture content and improve humidity control, though they may also induce moisture fluctuations. Inorganic materials with moderate vapour permeability are thus recommended as a balanced choice. This study highlights the value of considering interior panel configuration in tandem with typical operational modes, providing practical guidance for hygrothermal optimisation of LTS buildings in humid climates.</div></div>","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"111 ","pages":"Article 113182"},"PeriodicalIF":6.7,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Differential settlements of piled raft foundation: numerical simulations, empirical equations and design charts 桩筏基础的微分沉降：数值模拟、经验方程和设计图表

IF 6.4 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113118

Ruping LUO PhD, Zhidan LI PhD, Bitang ZHU PhD., Qijing YANG PhD

{"title":"Differential settlements of piled raft foundation: numerical simulations, empirical equations and design charts","authors":"Ruping LUO PhD, Zhidan LI PhD, Bitang ZHU PhD., Qijing YANG PhD","doi":"10.1016/j.jobe.2025.113118","DOIUrl":"https://doi.org/10.1016/j.jobe.2025.113118","url":null,"abstract":"Piled raft foundations are widely adopted for different kinds of infrastructure projects due to their high bearing capacity and deformation control efficiency. However, differential settlement which is critical to structural integrity remains inadequately addressed in existing design methods. This study employs three-dimensional finite element simulations to systematically analyze the influence of soil type, pile configuration, raft stiffness, and load distribution patterns on differential settlement. A novel parameter, the <ce:italic>relative flexural ratio</ce:italic> (defined as the angular distortion normalized by average settlement, <ce:italic>θ</ce:italic><ce:inf loc=\"post\"><ce:italic>r</ce:italic></ce:inf><ce:italic>/w</ce:italic><ce:inf loc=\"post\"><ce:italic>ave</ce:italic></ce:inf>), is proposed to characterize the differential settlement behavior. Parametric studies reveal that the <ce:italic>relative flexural ratio</ce:italic> exhibits strong normalization with piled raft stiffness (<ce:italic>K</ce:italic><ce:inf loc=\"post\"><ce:italic>r</ce:italic></ce:inf>), with load distribution patterns being the dominant influencing factor. Empirical equations and design charts linking <ce:italic>θ</ce:italic><ce:inf loc=\"post\"><ce:italic>r</ce:italic></ce:inf><ce:italic>/w</ce:italic><ce:inf loc=\"post\"><ce:italic>ave</ce:italic></ce:inf> to <ce:italic>K</ce:italic><ce:inf loc=\"post\"><ce:italic>r</ce:italic></ce:inf> are established for three typical load types (central, edge, and uniform). The reliability of the proposed design charts has been verified by three published case histories. Based on the design charts and the empirical equations provided in this paper, the distribution range of the maximum differential settlement of a piled raft foundation can be quickly obtained by calculating the average settlement of the piled raft foundation, offering a practical tool for preliminary differential settlement estimation in engineering design.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"13 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-objective optimization of an integrated energy system with shared energy storage 具有共享储能的集成能源系统多目标优化

IF 6.4 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113176

Guangtai Zhang, Hui Chen, Libin Yang, Jian Gao, Bingxiang Ji, Lingling Li

{"title":"Multi-objective optimization of an integrated energy system with shared energy storage","authors":"Guangtai Zhang, Hui Chen, Libin Yang, Jian Gao, Bingxiang Ji, Lingling Li","doi":"10.1016/j.jobe.2025.113176","DOIUrl":"https://doi.org/10.1016/j.jobe.2025.113176","url":null,"abstract":"To improve the operational efficiency and stability of an integrated energy system with shared energy storage, this study proposes a hierarchical optimization framework. A three-layer optimization model is constructed to address the problem that it is difficult to consider the interests of multiple parties and the synergy of multiple objectives in the traditional model. In the first layer, a fish eagle optimization algorithm is used to optimize the operator's energy supply revenue and subsidy cost. The second layer proposes a multi-objective osprey optimization algorithm (MOOOA) to solve the multi-objective optimization problem of the operational revenue and net load fluctuation of shared energy storage. The third layer is based on a mathematical solver to refine the optimization of demand response user agent cost. The proposed method reduces the user agent cost by 21.00% and the net load fluctuation by 49.99% with only 7.42% reduction in shared energy storage revenue, which verifies the role of layered optimization in synergizing the system with multiple actors. The operator-energy storage-user layered optimization architecture established in this study avoids the single optimization limitation of the traditional centralized model. The proposed MOOOA is verified to be universal by ZDT/UF test function. This study provides referable optimization ideas for the low-carbon and high-efficiency operation of integrated energy systems, which helps to promote energy structure transformation and sustainable development.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"625 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early-Age Mechanical and Shrinkage Performance of CaO-MgO Expansive Agent Self-Compacting Concrete CaO-MgO膨胀剂自密实混凝土早期力学性能及收缩性能

IF 6.4 2区工程技术

Journal of building engineering Pub Date : 2025-06-13 DOI: 10.1016/j.jobe.2025.113165

Xiao Guo, Longhui Liao, Kaizhong Xie, Wen Xu, Liqun Lu, Kang Huang

{"title":"Early-Age Mechanical and Shrinkage Performance of CaO-MgO Expansive Agent Self-Compacting Concrete","authors":"Xiao Guo, Longhui Liao, Kaizhong Xie, Wen Xu, Liqun Lu, Kang Huang","doi":"10.1016/j.jobe.2025.113165","DOIUrl":"https://doi.org/10.1016/j.jobe.2025.113165","url":null,"abstract":"Material properties and construction processes can cause structural issues like shrinkage and debonding in steel tube concrete. This study examines the effect of mix proportions on the mechanical and shrinkage properties of CaO-MgO expansive self-compacting concrete. Using X-ray diffraction, low-field nuclear magnetic resonance, scanning electron microscopy, and mechanical and shrinkage tests, this study examines how microstructural changes, structural characteristics, and pore evolution influence early-age strength and shrinkage. CaO-MgO expansive agents densify concrete microstructure, enhancing mechanical properties. At 28 days, a CaO 63 wt.%, MgO 37 wt.% mix increased cubic compressive strength (74.8 MPa) and splitting tensile strength (4.74 MPa) by 8.6% and 25.2%, respectively. Expansive agents reduced flowability from 50 mm to 27 mm but effectively suppressed shrinkage. Drying shrinkage decreased by 19.8%–99.9%, autogenous shrinkage by 20.0%–99.2%, with a CaO 75 wt.%, MgO 25 wt.% mix showing positive deformation. By analyzing the development of early-age mechanical strength, an expansive agent dosage model was proposed. Further research was conducted on early-age strength development based on various models, resulting in a predictive model for early-age mechanical strength in relation to the expansive agent dosage. This study demonstrates that CaO-MgO expansive agents optimize microstructure, enhance strength, and mitigate early shrinkage, providing a theoretical basis and practical guidance for improving concrete durability.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"14 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0